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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93faa9af737939636e63953470f06909fe8b41a7e58b958644d042483ba1cabd' 
  AND token = '88Vk5D60y/vKZWgtgC576ulOKowp2XFAbifFsO3wgoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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