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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a535b585bc7bbdcaa1a80fde424bcf63e71259e404b09acc6290c75e5ffcd20c' 
  AND token = 'zAGs8lm1Hxw60n9tyM8uWiZCwEYteX9UvgahBoSSy2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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