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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b956183fdd454de3e125b0de48e143015cf8a401a0af837a11443a15dcb57d' 
  AND token = 'm0/8a5y2P545L5lgqJPpX+z87LmGWXP4LSbVFQ5g+Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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