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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b581b05c3f63ab72824e34b9d628edd6dd68be439c23afb7a0a3c71876ab9b' 
  AND token = 'Bzg8ge9udCPQ3FnLSgHb5Yhmylia2PEDLBjORuWh4Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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