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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45f0d3a840e85bef2d173e2c7799bf380517c4239e01b7d23954fe9d8d9b7d28' 
  AND token = 'WYVobGLGyKIvOyOYq1WjKtAmSabebH0o+KfjcTo7KdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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