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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0383e3cc47909733ea29151426e3f4bed5aae7b0724bfe2f15fbe9c6d2138b' 
  AND token = 'weph/3xRT2FY8ogAgISqDuBN0WDLP4Z6mNQ1LvNSMsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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