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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0660675c8c39c2899a88deb144849780b4238c0b56ea93a1fe80a1e4d076846d' 
  AND token = '3+Ecwz0NJ1p80gSA6SOZbRSCFEWnT01okDBZl17+gos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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