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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c0b5b455dbf29f2a14750282b1720dd97a8e18159fc2485feb39de4450dd7c' 
  AND token = '1fAcBGNtIvexXI5XNvaLPzlw0qpF0AO44Iq4B+bkO/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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