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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12481b3e9d64c9d3eb703b90928ba7430042fabd7d56dc16ad703af059398efc' 
  AND token = 'zERQftKt0A5bIgi97t7rw7RmMzo+bjJSXAO3/0SeliU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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