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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f0bbcde1c223c06831870c37a2be9c176d197cdb27897b3c6a82edc3b5219dc' 
  AND token = 'zn0ncfg2WNRJo6UFbLHTfIAAc3bMAIxdFTtiTq54Xh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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