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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd287f5269de6cd5558e6f880a91e07e7a438f059d19244b8af18e81008bce0e4' 
  AND token = 'pSGM9sXsgUJknhHjrufvdZ0BZ87QY995YKhLDgYlTMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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