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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9f0fb4131e27274c2923d663f0a4ec631ea73c4de27b76ec15901637fa5908' 
  AND token = 'sGJjrJ5PX8r8otZSf24t3PejhiZcUpw8DLlhb4FnxfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00117

JSON explain

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