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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92af5027ef0ee6e92204a1f843b4d9e815a86997ff3a4afb2a7a1add754edf6' 
  AND token = 'QRLyIwpUarQtypRgtbGI5JzkCLBD+afYz0Swmqu1Hmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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