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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9569d2af9673a4df4096256d7d1225ff786c5b149740ab6d0f02fd091950b35' 
  AND token = '7HyYyjk7K+1RaPZIShEVdyAd8szZtJr7wQv30r4z/ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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