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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a4c2a697c39dbc5c0f80910aa3fd36156cafd8a0645164adc2e4ea27b56c2ba' 
  AND token = 'gD4L9vTONvyJwR0Hf8S6az7Ze3R4K5VvP9uGIA0r4Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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