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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c081232d05d77f7d16e026b21bf4d3fbb13c3c3b415800f9893e4a983442b5b0' 
  AND token = '0jblxM4dxsrABarPmb5Am8spcBOC1JRxE5SjMvFdKj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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