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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8a663dbe69249dacc061ce31743d4ff29f90a4cdb24618e1ac5cdf9e239871' 
  AND token = '1cshNu/F9z/ABw6N996G+tqPxfqWiTkxJb3rG3p4V9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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