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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ca97844a667f9d8c6ebec7d229780f228782fd59b1db74f457a4cab3a5e0d41' 
  AND token = 'q8dTCmtxW8HDKtBBQmRCz73P9DlpPo2rzLNc7qDJvis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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