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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f7880fd4d40cded00a872fd67527ee493b0ed8320996bc863aa73ce5564f98' 
  AND token = 'MQGnwZHkhtwqD9eaPB8sh0l1flUA6U7azZoHV81Cr0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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