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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25d1ed2ae4e0edb88e7f2b4ad173a257dc11b1c9589ec0811638cc76317a98a1' 
  AND token = 'J70fBBnnR6QYbHxUwzcYRV8mfxrBwcyi8oT/QVgOEUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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