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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823ca7af6b5210d94a2c8529c2482ef9cbd51a153835742ffb22f23ba4e31b18' 
  AND token = 'uN5o0FJsBJEpsfQWmyWl4Y7NgIsFJU1PMni5SKqKe/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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