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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc52eb8cb1719394c845132c7e50ffc167faf4bbf7c0e7c802fd7d94027fd25' 
  AND token = 'QuXYXwTHxCpsvdgwXcopzvoBEADz0AYctx5YpPBuLlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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