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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd2c5b9f3c244c4079014759b5d505d1bf0875bf67278f58b3c56de03c7bfc4' 
  AND token = 'kK1RBunB25uHlWTQf4dwrhCRiK2o4ogDpknMDv1h58I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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