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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22dc73ff265f0cfe80b4712c23f6a3c80b4f5e48e7d974c771e49ebe2c904d8b' 
  AND token = 'whrSZR27CEtQjfQWaPCFEAVzN688YRK50K+hqD6n3/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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