SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898d2b92c098920db985f3a390f94e9ad7b2b0f310d7944546d6b31bf5d81630' 
  AND token = 'XH2AMqwnMMA77JZkGm+m1SoWjPlvKOIb1kWWraQyNgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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