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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2dd896612a85666b98d41ef6f99a3f9630d98e481cb95da9cd245e518cdb371' 
  AND token = 'Q2yeYPGCtePPE66xpnY9o6fJCH9oxglzW74K8JcSriA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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