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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2297b8cb959b13b05521860c3eb629893e498fec8ebeefa4c83130085386f4' 
  AND token = '6jDl0OdxS6Sv8ZgIyqcMCoWyNyR/f//KTlZsraFgqVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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