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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36196ff2751474a22f1fc88c8bbe56f3d871b3c3719731899d779fd6f9fd3105' 
  AND token = 'Yd4ts/4ezCD8Dq7bQoj0Fx8tS6v6MWnJ5Ht+9XChdaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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