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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5ea16cb328c7455e2e5f937474d9bd85b29fe690813078243fc005cdc6c148' 
  AND token = 'BT5sRqlVts76pvmdoNsB8enAl1H1kYgO06cZ8axgaQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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