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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a408b087e8d4c1ec5d69258fae4f5cc73236bdc807de0e58b2d9ab8eb6399375' 
  AND token = 'JAGjA3LnmXe8637/G7VmA+o/XVlTVbKmW2tNBlcgBk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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