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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f35ed103f3695be3e5d6809542bd9cb30f335a33d73c273996e4f5cb7d41d7e' 
  AND token = 'TKjINBRlCE4jaQfLx7fA8DQsDCQXkmk4Js6SWiZhqGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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