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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4302f83c01d755bf5dfec63921d513dd2f8527662f4b4077ea8e7bfb1e8d7855' 
  AND token = 'L/ZF5Qy1+zJaRdbFgVEz4X7ANYET+JSXLWy0len7lE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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