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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08cb450f93f824ccd3f2087e562ed0868ccffbbff49542ad8a1bf10041d5a998' 
  AND token = 'DVPDmmRgYnxyBqgkY0H/c9Uq1eEavJQ5qyETSEehkv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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