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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b198ef3532b73791d8bd723908eef28bc08a1935bcdb705c32ea1e1ff5ea9ba' 
  AND token = 'DUh/bdYdxo9Tg0/jriU7+zEAX5tFwPSNurcda/Dr4+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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