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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c805c0a7615c44ee50c3911321a3c10d909bb79b789eea945a085b52e84eda' 
  AND token = 'aYA1hyrYCDio/UI5FiCvXuAbRYCdmAYB4Qs5tMzDd3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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