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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739ddbb6a8ac8c4f5faf59c9a75c7a545098b5e823754843ce6cf460982be849' 
  AND token = 'MyRc4fNxu/xI4wKjzROo2/W1zKl0q8AMio9V0Jw8J6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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