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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5e85fd10ee3b4ecd13195e51fbf98c2c0e90a4f81083c5960a36dfe87de5f9' 
  AND token = 'yA8oY5cm49kUu4EpL/cEnX8j0aFaQ0kayii4t+wquvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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