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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30444077e8521efe8dab7d6c5eae7d6c165479c8722d92e4ec45651c0592d37' 
  AND token = 'Yti+QyPC27KZjFhJmSy1h0/nLBLUDehRH4wX4n1TiW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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