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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e7bb2f84ef0d92eafa9bc228b3db3fd1f12203364a3e766e90a3caa08aa860' 
  AND token = 'TnKh+MwSgQfBqMZrRgL/CkuqiEWdPiUHHCfs91G+4Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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