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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54bf08bf0d8a6ef304279503919049d2ba66ae0ec75d6d61bed5b54924163e4e' 
  AND token = 'OKA4Kfj4zhvOzLgAgNYjnpkGbJc5XNcp9KeTJNt/sYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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