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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ffbea0202dc424d7c7272a3637825ffe434bc86d8974bbd255a8883c2252f3f' 
  AND token = 'wtFi0Db2/SOwPzdEzHdfWpwe3+MtyAOtq1xjNybxoww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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