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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdedf249cc13ee8307ea8bfafc466b4c1ea577e265c3a06f1ac87cfabc314542' 
  AND token = 'RIEmcLl5d/JC6ITQ/gWs6ioXUGU1kqdo+C8t6jBZ2F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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