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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6126fb1f02ed74c4d9cdeb0894a1b60e9b88ebbb60c5035fcada41520d7310c3' 
  AND token = 'iP+mh3Mib2bGGOyTggyaCfNbENbeSaW3LUqOZ/T7O+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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