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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da34a4c68e112e2eac41f0cff7759dfc53ea3de116fba5ae1181cdbb294fe07' 
  AND token = 'JcfVioZWwQbPKPJT4enp819xZiIdkp1AnW+B6G7wRCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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