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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b71566c90220fb5ead10164d5ea59bc27b7b1a7864fa866bb64e74bea03e8cf' 
  AND token = '65ay1M3BI+M5HTCZbCvEQvpPRewnZ6p3+fUjfxDgqaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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