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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9013b9ebc192a0a8099df59b92f84af43bb3d58239081a6ec3bed84065db5763' 
  AND token = '3GTgtyNvmC/AxH0+f465CgPG4FFLt4R81S/BWVYrhSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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