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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84757915da26ee502a096c0c7282fc7dc10f09987cd82405ed4c4efa40b69a91' 
  AND token = 'QChUp4KlltYbrZDaJFvX+NiTyFX2kDL5fwhBCI/QyR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}