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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002e16fd42322bd36e0ebffcf0b24f8df28910bf6135a4a7cac9e640393283a6' 
  AND token = 'rPwfHunCPIjtnXxd6iNp/4lkPw4PAqCkp/37ZOSNkI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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