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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36999eaadac54595296d2bd63efd5fabd0f485f4eea7917a91882e7b6e666bbe' 
  AND token = '66QEftpro/P+PAnI1QoFkinM3rRSEl12hbiR4HKZc1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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