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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799e0c8f70c3f718dedb96a6d60fe3649e96b9c218d5b6a134bf8f21866cddad' 
  AND token = 'SnYLkkmkUjScBEengNfQ+41qDQ1+AVzniHCDdWWeBzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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