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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daea0edb0cd78c4e4d16245c84c6468e58137e4424809d884d414110363a766e' 
  AND token = 'RhlkdyQMgNrEHImE96yeMPzSsRKN9AwFvF5Uwbgr0dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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