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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b442e958e223f6d5ccf0293013ae17fb7df679e882d4b7c58ca11f5fdf6b89' 
  AND token = 'zeq5N5hiONw3LQtVNBV/8pnknDnWzZyb0DTTyrwVyAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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