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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3fa9025d19913a385643c71898bb8a53f10f3887d9298a214fdb9a9447b7530' 
  AND token = 'EXptoyJ35bwFT2Bg4kcB9qspdAHIT00CdPqDgbFvf9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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