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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '007fe8f74683e832d6d7e838fb54a2b35695c7b2b14dd3bf2aa4b6460a270e98' 
  AND token = 'zsVTCCclEwLFn+zH1PcD84UHpH1+Ft2BkujfL0NybYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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