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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e40cc139e98e905df555f9f362f0435135312bde6d0827522c8da88f5f56a50b' 
  AND token = 'd0spwgYjO2kRIPORyq43eM9S+Hb92FRWOpxy1mCu20Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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