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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d80e9c2d28d6a85b69386fcfb7d3c81cfb06990baea87405575d2e1b4dc5f82' 
  AND token = 'YP437ZQMDkMjeL1EULUXrm8qjKlA5/NtGCRk/eIcc64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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